On Fri, Apr 29, 2016 at 08:26:00PM +0530, Pratyush Anand wrote: > Hi Russell, > > On Thu, Apr 28, 2016 at 2:58 PM, Russell King > <rmk+kernel at arm.linux.org.uk> wrote: > > Advertise the location of bootable RAM to kexec-tools. kexec needs to > > know where it can place the kernel in RAM, and so be executable when > > the system needs to jump into it. > > > > Advertise these areas in /proc/iomem with a "System RAM (boot alias)" > > tag. > > > > Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk> > > Can you please also share git tree path of corresponding kexec-tools changes? > > Could it be a better idea (if things in user space become simpler) > that in stead of patch 5 and 6, we pass arch_phys_to_idmap_offset to > user space, and then user space manipulates existing "Crash kernel" > and "System RAM" resources. Given that it's only _one_ platform right now, I don't think that additional complexity is worth it. It means that we have to invent some API to do it, and I don't see why userspace should even care about having the delta exported - especially when the conversion may not be as trivial. The method I've implemented here keeps things completely independent of whatever conversion between boot and running physical addresses may be present on the kernel side as far as userspace is concerned. -- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
